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shaggy
Posting Yak Master
248 Posts |
 Posted - 2014-01-28 : 09:34:52
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| Hi,SP is taking more time for compilation.SP has 30 update statement all are using indexed column in where clause.how can i force SP to take less compilation time. pls advice |
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TG
Master Smack Fu Yak Hacker
6065 Posts |
Posted - 2014-01-28 : 10:20:38
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One of the things that causes a recompile is when a significant change in the statistics occurs - like from updates. What I would do if you haven't already is run a profiler trace with one of the events being SP:Recompile. That way you can confirm that the procedure is being recompiled one or more times during execution. If that is the case you can use a query hint to suppress the recompiles. From books online (query hints):quote:
KEEPFIXED PLAN Forces the query optimizer not to recompile a query due to changes in statistics. Specifying KEEPFIXED PLAN makes sure that a query will be recompiled only if the schema of the underlying tables is changed or if sp_recompile is executed against those tables.
EDIT:of course this are obvious repercussions with this - maybe the optimizer should change plans based on the latest statistics. Be One with the OptimizerTG |
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shaggy
Posting Yak Master
248 Posts |
Posted - 2014-01-29 : 00:29:59
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| Thanks TG,But the second time my SP execution is fast due to already plan avaible in cache. |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2014-01-29 : 04:06:11
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quote:
Originally posted by shaggy
Thanks TG,But the second time my SP execution is fast due to already plan avaible in cache.
yep..once plan is in cacahe sp will execute faster------------------------------------------------------------------------------------------------------SQL Server MVPhttp://visakhm.blogspot.com/https://www.facebook.com/VmBlogs |
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shaggy
Posting Yak Master
248 Posts |
Posted - 2014-01-29 : 04:14:42
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| So can I freeze plan in cache so that evertime i execute Sp it will be faster. |
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TG
Master Smack Fu Yak Hacker
6065 Posts |
Posted - 2014-01-29 : 10:07:51
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| It is sounding more like the data is cached for subsequent runs. Why did you believe that the time is taken for execution plan compilation? If you run the trace I suggested you will know how the time is divided between recompiles vs. statement duration.Be One with the OptimizerTG |
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SP compilation time